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Raw material skin unhairing method

A raw material, animal skin technology, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, chemical treatment before tanning, etc.

Active Publication Date: 2016-05-25
SICHUAN DOWELL SCI & TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the technical problem to be solved by the present invention is to provide a method for depilating raw hides. The depilation method provided by the present invention can reduce the damage to the leather surface, and is not easy to cause defects such as leather loose surface and grain surface damage, and the process is simple. , good hair removal effect

Method used

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  • Raw material skin unhairing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The raw hide is sheepskin preserved in salt, and the weight is calculated as a percentage of skin weight.

[0052] (1) Washing: 300% clean water washing, temperature: 25°C, rotation speed: 3-6rmp, to remove salt and dirt attached to the leather surface;

[0053] (2) Pre-soaking water: add 400% water, 0.5% soda ash and 0.5% FG-B surfactant to the drum, temperature: 25°C, speed: 3-6rmp, rotate for 5 minutes and stop for 55 minutes, 5 times, a total of 5h, let stand for 10h; remove the flesh, remove the subcutaneous tissue.

[0054] (3) Main immersion: Add 400% water, 0.5% soda ash and 0.5% FG-B surfactant to the drum, temperature: 25°C, speed: 3-6rmp, rotate for 5 minutes and stop for 55 minutes, 6 times, a total of 6h.

[0055] (4) Hair removal: add 3% animal skin compound enzyme depilatory agent to the main soaking bath (fast depilatory speed), the specific formula is: Novozymes SG protease 2kg, 1398 protease 12kg, elastase TX2kg, lipase UltraG2kg , sodium lauryl sul...

Embodiment 2

[0064] The raw hide is sheepskin preserved in salt, and the weight is calculated as a percentage of skin weight.

[0065] (1) Washing: 300% clean water washing, temperature: 25°C, rotation speed: 3-6rmp, to remove salt and dirt attached to the leather surface;

[0066] (2) Pre-soaking water: add 400% water, 0.5% soda ash and 0.5% FG-B surfactant to the drum, temperature: 25°C, speed: 3-6rmp, rotate for 5 minutes and stop for 55 minutes, 5 times, a total of 5h, let stand for 12h; remove the flesh, remove the subcutaneous tissue.

[0067] (3) Main immersion: Add 400% water, 0.5% soda ash and 0.5% FG-B surfactant to the drum, temperature: 25°C, speed: 3-6rmp, rotate for 5 minutes and stop for 55 minutes, 6 times, a total of 6h.

[0068] (4) Hair removal: Add 3% animal skin compound enzyme hair removal agent (medium hair removal speed) to the main soaking bath, the specific formula is: Novozymes PY protease 1.2kg, 1398 protease 8kg, elastase TX1.0kg, Lipase UltraG 2kg, sodium l...

Embodiment 3

[0076] The raw hide is sheepskin preserved in salt, and the weight is calculated as a percentage of skin weight.

[0077] (1) Washing: 300% clean water washing, temperature: 25°C, rotation speed: 3-6rmp, to remove salt and dirt attached to the leather surface;

[0078] (2) Pre-soaking water: add 400% water, 0.5% soda ash and 0.5% FG-B surfactant to the drum, temperature: 25°C, speed: 3-6rmp, rotate for 5 minutes and stop for 55 minutes, 5 times, a total of 5h, let stand for 12h; remove the flesh, remove the subcutaneous tissue.

[0079] (3) Main immersion: Add 400% water, 0.5% soda ash and 0.5% FG-B surfactant to the drum, temperature: 25°C, speed: 3-6rmp, rotate for 5 minutes and stop for 55 minutes, 6 times, a total of 6h.

[0080] (4) Hair removal: Add 3% animal skin compound enzyme depilatory agent (slower hair removal speed) to the main soaking bath, the specific formula is: Novozymes’ PY protease 0.5kg, Novozymes’ SG protease 0.5kg, Mix 5kg of 1398 protease, 0.5kg of ...

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Abstract

The invention provides a raw material skin unhairing method which comprises the following steps: firstly, under the action of composite enzyme depilatory, soaking raw material skin soaked in water into the depilatory to remove hair, taking out, thereby obtaining a half finished unhaired product; spraying a protein inhibition protecting liquid on the surface of the half finished unhaired product obtained in the former step, standing, and shaving, and thereby obtaining unhaired raw material skin, wherein the protein inhibition protecting liquid is a mixed liquid of a protease activity inhibitor and an animal skin protein protecting agent. As the animal skin composite enzyme is adopted to remove hair, association of hair follicle and hair papilla to hair roots can be effectively broken, a relatively rapid and relatively ideal hair root loosening effect can be achieved, damage to a loose side and a grain side can be reduced, and moreover after the hair roots at fiber loosened parts are loosened, as the mixed liquid of the protease activity inhibitor and the animal skin protein protecting agent is applied or spayed, over-action of protease can be avoided, and defects such as loose side and grain side loss can be further avoided.

Description

technical field [0001] The invention belongs to the technical field of leather treatment and processing, and in particular relates to a method for depilating raw hides. Background technique [0002] Leather processing has a history of thousands of years. After a long period of development, tanning has developed from a simple manual operation to an important industrial technology field. Leather treatment refers to the process of turning perishable raw hides, that is, raw hides, into soft and non-perishable leather after physical and chemical processing such as depilation and tanning. From raw leather to finished leather, it needs to go through dozens of processing procedures, such as soaking, fleshing, degreasing, dehairing, alkali soaking, deliming, softening, pickling, tanning, retanning, neutralization, dyeing, oiling, Drying, finishing and more. Among the many steps of leather processing, depilation of raw hides is a very important link in the initial stage of leather t...

Claims

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Application Information

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IPC IPC(8): C14C1/06
CPCC14C1/065
Inventor 许冰斌严建林
Owner SICHUAN DOWELL SCI & TECH INC
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